Expands a field with dots into an object field. This processor allows fields
with dots in the name to be accessible by other processors in the pipeline.
Otherwise these fields can’t be accessed by any processor.

Table 35. Dot Expand Options

Name

Required

Default

Description

field

yes

-

The field to expand into an object field

path

no

-

The field that contains the field to expand. Only required if the field to expand is part another object field, because the field option can only understand leaf fields.

{
"dot_expander": {
"field": "foo.bar"
}
}

For example the dot expand processor would turn this document:

{
"foo.bar" : "value"
}

into:

{
"foo" : {
"bar" : "value"
}
}

If there is already a bar field nested under foo then
this processor merges the foo.bar field into it. If the field is
a scalar value then it will turn that field into an array field.

For example, the following document:

{
"foo.bar" : "value2",
"foo" : {
"bar" : "value1"
}
}

is transformed by the dot_expander processor into:

{
"foo" : {
"bar" : ["value1", "value2"]
}
}

If any field outside of the leaf field conflicts with a pre-existing field of the same name,
then that field needs to be renamed first.

Consider the following document:

{
"foo": "value1",
"foo.bar": "value2"
}

Then the foo needs to be renamed first before the dot_expander
processor is applied. So in order for the foo.bar field to properly
be expanded into the bar field under the foo field the following
pipeline should be used: